26534243664 has 120 divisors (see below), whose sum is σ = 79987594752. Its totient is φ = 8187252480.

The previous prime is 26534243653. The next prime is 26534243669. The reversal of 26534243664 is 46634243562.

26534243664 is a `hidden beast` number, since 2 + 6 + 534 + 24 + 36 + 64 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26534243669) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26547 + ... + 231890.

Almost surely, 2^26534243664 is an apocalyptic number.

26534243664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26534243664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39993797376).

26534243664 is an abundant number, since it is smaller than the sum of its proper divisors (53453351088).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

26534243664 is a wasteful number, since it uses less digits than its factorization.

26534243664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258505 (or 258496 counting only the distinct ones).

The product of its digits is 2488320, while the sum is 45.

The spelling of 26534243664 in words is "twenty-six billion, five hundred thirty-four million, two hundred forty-three thousand, six hundred sixty-four".